Geoeg bteemasos



(No Model.)

G. BIRKMANN.

LATHE matron. No. 309,288. A Patented Dec. 16,1884.

J e I A R e i v r H lul WITNESSES UnTTTn STATES PATENT Trice.

GEOR-G BIRKMANN, OF NENV YORK, N. Y.

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 309,288, dated December16, 1884.

Application filed June 18, 1884. (No model.)

To aZZ whom it may concern.-

Be it known that L'Gnone BIRKMANN, of the city, county, and State of NewYork, have invented certain new and useful Improvernents inLathe-Chucks, of which the following is a specification.

This invention has reference to an improved lathe-chuck for holdingboring-tools and shafts for facing; and the invention consists of alathe chuck in which a conical sleeve is screwed on the solid or hollowspindle of the lathe, said sleeve being connected by a screwcollar witha cylindrical socket, the latter receiving a number of smaller socketsfor holding the shanks of the different sizes of boringdrills, orbushings'of different sizes for holding the shafts to be faced.

In the accompanying drawings, Figure 1 represents a verticallongitudinal section of my improved lathe-chuck, shown with a set of.detaehable sockets for the shanks of the different boring-tools. Fig. 1is a side View of the smallest tool-socket detached. Fig. 2 is avertical longitudinal section of the lathechuck arranged to support ashaft; Fig. 3, a Vertical longitudinal section of the same, shown asattached rigidly to one of the tail stocks of the lathe; and Fig. 4.- isan end elevation of the chuck, partly in section on line :v m, Fig. 1.

Similar letters of reference indicate corresponding parts.

A in the drawings represents a conical sleeve that corresponds in sizeto the diameter of the solid or hollow lathe-spindle S. The conicalsleeve A is screwed by an interior screw-thread on theexteriorly-threaded\ spindle S, as shown in Figs. 1 and 2. The conicalsleeve is turned off at the thicker end, so as to form a shoulder, a,for an angular screw-collar, O, the threaded forward-extend ing portionof which engages the threaded rear end of a cylindrical main socket, D,that is fitted by its rear end accurately to the conical sleeve A. Theinner front part of the main socket D is made cylindrical, and adaptedto receive either a set or nest of auxiliary sockets, D D D, ofdifferent sizes, which are secured in position byset-screws d d saidsockets serving to receive the shanks of different sizes of drills orother boring-tools. The innermost socket, D, has a flattened rear end,which fits into an extension-socket of the next larger socket, D asshown in Figs. 1 and 1, by which the socket D is retained in position inconnection with the pressure of the work on the boring-tool withoutrequiring a special set-screw.

When the chuck is desired to be used for facing shafts, one or morecylindrical bushings, E, are inserted into the main socket D, andretained therein by set-screws e, that also press upon the shaft, so asto retain the same in rigid position against longitudinal displacement,while axial displacement is prevented by a collar, E, and set-screw e,the collar E engaging by a lug, e", a recess, 6 of the main socket D.The shaft to be faced in the lathe can thus be rigidly secured to thelathe-chuck and turned with the same, so as to be operated upon by thefacing-tool.

In some cases it is desired to arrange the boring-tool in a fixedposition on the lathe and conduct the work against the same. In thiscase the conical sleeve A is screwed upon a solid piece, F, secured toone of the tailstocks of the lathe, as shown in Fig. 3.

The advantages of my improved lathe-chuck are, first, that it can beadapted for use with any size of lathe-spindles by providing conicalsleeves A of different diameters; secondly, that it is adapted toperform different kinds of work, such as boring holes of differentsizes, facing shafts of different sizes, 85c; and, lastly, that it canbe used with any metal-working lathe in common use with little extraexpense.

Having thus described my invention, I claim ,as new and desire to secureby Letters Patent- The combination, with a lathespindle, of a conicalsleeve screwed therein, a cylindrical main socket fitted to the sleeve,a screw-collar connecting the sleeve and main socket, and one or moreauxiliary sockets or bushings screwed into the main socket and adaptedto receive different sizes of boring-tools or support different sizes ofshafts, substantially as and for the purpose set forth.

. I11 testimony that I claim the foregoing as IOO

